OK, this question has paralyzed me. I hope you're happy. Seriously, when I was a kid I hated my name. I like my name now because it represents me, and I probably wouldn't change it. However, I think it's intriguing to consider a rename to use as a pen name or other type of professional name.
If I were to rename myself, I would probably go for something dramatic or romantic – or maybe substantial, like a three-namer. A three-namer could be Barbara Taylor Bradford (too bad it's already taken). How about Jillian Hubbard Smith or Jillian Hubbard-Smith or or Mary Ronson Reinhart or Mary McKelvy Graham? I actually knew someone named Mary McKelvy Graham; she is no longer with us, so I could probably use her name without getting into trouble. It has substance.
Now for dramatic/romantic. I love Eleanore of Aquitaine as a person, even though she lived about a thousand years ago (literally), but could probably not use her name because it is actually a book title. So, how to revise it? Eleanor from Aquitaine (no), Eleanor Aquitaine or Eleanor D. Aquitaine (possibly). How about something really florid, like Alexandra Celeste Shandelle? If I were a stripper or porn star, I would seriously consider Brandi Alexander.
Time to stop. This could go on forever.
Of course, in renaming myself I would need to make sure the new name was in harmony with the old. What kind of numerologist would I be if I overlooked this absolutely critical element?